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Thanks for the question, were possible you must seal the tubes like the fork blades , seat stays ,
I worked for Holdsworth for 9 years, Chas Roberts for 28 years,and have never, replaced seat stays because of rust, on these two British trusted frame bulders.
But have replaced stays on 45year old Colnago frames , with unfilled air holes ,
I same type of repair over and over .
I would be interested to hear what other frame build on this forum think
skalliwag-
Thanks for replying. Finding this really interesting.
What would you do on a lugged frame? The hole at the bottom bracket end of the chain stays would be too large to close up no?
And would you suggest closing up air holes on frames built with them? Actually, I guess it’s pointless dealing with the air hole at the dropout when there are holes between seatstays and the seattube and these would be impossible to access to seal on a built frame.
M_V
IANAFB but I was under the impression that it's very difficult to provide a seal 100% impermeable to moisture vapour so best practice was to have the vent hole left open so that the frame can 'breathe' as it were.
Edit: This sounds like I'm doubting the quality of workmanship from Feather/Vaz. I don't mean to, just want to pose the question.